|Category||Analog & Mixed-Signal Processing|
|Description||QFN Packaged, +/-15kV Esd Protected, +2.7V to +5.5V, 10Nanoamp, 250kbps, RS-232 Transmitters/receivers|
|Datasheet||Download ISL4241E datasheet
The Intersil ISL424XE devices are to 5.5V powered RS-232 transmitters/receivers which meet ElA/TIA-232 and V.28/V.24 specifications, even at VCC = 3.0V. Additionally, they provide ±15kV ESD protection (IEC61000-4-2 Air Gap and Human Body Model) on transmitter outputs and receiver inputs (RS-232 pins). Targeted applications are PDAs, Palmtops, and notebook and laptop computers where the low operational, and even lower standby, power consumption is critical. Efficient on-chip charge pumps, coupled with manual and automatic powerdown functions, reduce the standby supply current a 10nA trickle. Tiny x 5mm Quad Flat No-Lead (QFN) packaging and the use of small, low value capacitors ensure board space savings as well. Data rates greater than 250kbps are guaranteed at worst case load conditions. The ISL424XE are 3 driver, 5 receiver devices that, coupled with the 5x5 QFN package, provide the industry's smallest, lowest power complete serial port suitable for PDAs, and laptop or notebook computers. The 5x5 QFN requires 60% less board area than a 28 lead TSSOP, and is nearly 20% thinner. The devices also include a noninverting alwaysactive receiver for "wake-up" capability. The ISL4243E features an automatic powerdown function that powers down the on-chip power-supply and driver circuits. This occurs when an attached peripheral device is shut off or the RS-232 cable is removed, conserving system power automatically without changes to the hardware or operating system. It powers up again when a valid RS-232 voltage is applied to any receiver input. Table 1 summarizes the features of the ISL424XE, while Application Note AN9863 summarizes the features of each device comprising the 3V RS-232 family.Features
Parameters Fully Specified for 10% Tolerance Supplies and Full Industrial Temp Range Available in Small QFN x 5mm) Package which is 60% Smaller than a 28 Lead TSSOP ESD Protection for RS-232 I/O Pins ±15kV (IEC61000) Meets EIA/TIA-232 and V.28/V.24 Specifications 3V RS-232 Compatible with VCC = 2.7V On-Chip Voltage Converters Require Only Four External 0.1µF Capacitors Manual and Automatic Powerdown Features Receiver Hysteresis For Improved Noise Immunity Guaranteed Minimum Data Rate. 250kbps Wide Power Supply Range. Single to +5.5V Low Supply Current in Powerdown State.10nAApplications
Any Space Constrained System Requiring RS-232 Ports - Battery Powered, Hand-Held, and Portable Equipment - Laptop Computers, Notebooks - PDAs and Palmtops, Data Cables - Cellular/Mobile Phones, Digital Cameras, GPS Receivers
Technical Brief TB363 "Guidelines for Handling and Processing Moisture Sensitive Surface Mount Devices "Technical Brief TB379 "Thermal Characterization of Packages for ICs" Technical Brief TB389 "PCB Land Pattern Design and Surface Mount Guidelines for QFN Packages"
TABLE 1. SUMMARY OF FEATURES PART NUMBER ISL4241E ISL4243E NO. OF MONITOR Rx. NO. OF NO. OF QFN PKG. (ROUTB) Tx. Rx. AVAILABLE? YES 2 1 DATA RATE (kbps) 250 Rx. ENABLE FUNCTION? YES NO READY OUTPUT? NO MANUAL POWERDOWN? YES AUTOMATIC POWERDOWN FUNCTION? NO YES
PART NO. ISL4243EIR ISL4243EIR-T TEMP. RANGE (oC) to 85 PACKAGE 32 Ld QFN Tape & Reel 32 Ld QFN Tape & Reel PKG. NO. L32.5x5
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright © Intersil Americas Inc. 2003. All Rights Reserved All other trademarks mentioned are the property of their respective owners.
PIN VCC V+ VGND C1C2+ C2TIN TOUT RIN ROUT ROUTB INVALID System power supply input to 5.5V). Internally generated positive transmitter supply (+5.5V). Internally generated negative transmitter supply (-5.5V). Ground connection. External capacitor (voltage doubler) is connected to this lead. External capacitor (voltage doubler) is connected to this lead. External capacitor (voltage inverter) is connected to this lead. External capacitor (voltage inverter) is connected to this lead. TTL/CMOS compatible transmitter Inputs. ±15kV ESD Protected, RS-232 level (nominally ±5.5V) transmitter outputs. ±15kV ESD Protected, RS-232 compatible receiver inputs. TTL/CMOS level receiver outputs. TTL/CMOS level, noninverting, always enabled receiver outputs. Active low output that indicates if no valid RS-232 levels are present on any receiver input. FUNCTION
FORCEOFF Active low to shut down transmitters and on-chip power supply. This overrides any automatic circuitry and FORCEON (see Table 2). FORCEON EN SHDN NC Active high input to override automatic powerdown circuitry thereby keeping transmitters active. (FORCEOFF must be high). Active low receiver enable control. Active low input to shut down transmitters and on-board power supply, to place device in low power mode. No Connection
0.1µF 26 VCC T3OUT RS-232 LEVELS R2OUTB 18 TTL/CMOS LOGIC LEVELS 22 21 SHDN GND 24 VCC TO POWER CONTROL LOGIC 21 FORCEOFF 20 INVALID GND 22 R5 FORCEON R3IN RS-232 LEVELS 1 R1IN TTL/CMOS LOGIC LEVELS R3IN RS-232 LEVELS 23 +
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